Of the people on NBC, it was Andrea Mitchell, the wife of Alan Greenspan, who first names Usama bin Laden as a possible suspect in the attacks.
David Gregory who was with the President said Bush was made aware on route to the event at the school.
Andrea Mitchell provides far more detail than anybody previously had regarding what has happened. She cites an unnamed "top US official",etc.
While Ms. Greenspan seeds the myth that UBL did it, we see a bright flash of light in the center, near the top of the hole in the North Tower.